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Amélioration du transfert de chaleur à l'aide d'une mousse métallique pendant l'ébullition libre nucléée d'un mélange de frigorigène et d'huile faisant appel à un grand éventail de concentrations d'huiles.

Heat transfer enhancement by metal foam during nucleate pool boiling of refrigerant/oil mixture at a wide range of oil concentration.

Auteurs : ZHU Y., HU H., DING G., et al.

Type d'article : Article

Résumé

Nucleate pool boiling heat transfer characteristics of refrigerant/oil mixtures on metal foam covers were experimentally investigated at a wide range of oil concentrations. The refrigerant and oil are R113 and VG68, respectively; and the oil concentration varies from 0 to 40%. The copper foams have pores per inch (ppi) of 10 and 20 and porosity from 90 to 98%. Experimental conditions include a saturation pressure of 101 kPa (14.696 psi), and heat flux from 30 to 137 kW/m2 (2.6417 to 12.064 Btu/s.ft2). The experimental results indicate that the nucleate pool boiling heat transfer coefficients on copper foam covers are larger than those on a plain heating surface by a maximum of 450%; the presence of oil deteriorates the nucleate pool boiling heat transfer on copper foam covers by a maximum of 90%. With the increase of oil concentration, the deterioration effect on high ppi metal foams is more obvious than that for low ppi. A correlation for predicting the nucleate pool boiling heat transfer coefficient of refrigerant/oil mixtures on metal foam covers is developed, and it agrees with 90% of the experimental data within a deviation of ±30%.

Détails

  • Titre original : Heat transfer enhancement by metal foam during nucleate pool boiling of refrigerant/oil mixture at a wide range of oil concentration.
  • Identifiant de la fiche : 30004848
  • Langues : Anglais
  • Source : HVAC&R Research - vol. 18 - n. 3
  • Date d'édition : 06/2012
  • DOI : http://dx.doi.org/10.1080/10789669.2012.623565

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